of science news, delivered fresh every monday, wednesday and friday. today's daily special-- the mars rover rumors. and on "need to know" tonight, an encore report about an investigation into alleged abuses by u.s. border patrol officers. all that and more is on our web site, newshour.pbs.org. >> warner: and again to our honor roll of american service personnel killed in the afghanistan conflict. we add them as their deaths are made official and photographs become available. here, in silence, are eight more. >> warner: and that's the newshour for tonight. i'm margaret warner. >> brown: and i'm jeffrey brown. "washington week" can be seen later this evening on most pbs stations. we'll see you online, and again here monday evening. have a nice weekend. thank you and good night. >> major funding for the pbs newshour has been provided by: ♪ ♪ ♪ ♪ ♪ ♪ >> moving our economy for 160 years. bnsf, the engine that connects us. >> and by the bill and melinda gates foundation. dedicated to the idea that all people deserve the chance to live a healthy,